Answer
See the answer below.
Work Step by Step
(Lines with * have a required answer)
* Partial pressure of $CO_2$: $1.56-1.34=0.22\ atm$
Mol fraction of $CO_2$: $0.22/1.56×100\%=14.10\%$
Total number of moles:
$n=1.56\ atm×0.55\ L/0.082/297\ K$
$n=0.0352\ mol$
Number of moles of oxygen:
$0.0870\ g\div 32.0\ g/mol=0.00272\ mol$
Mol fraction of oxygen:
$0.00272\ mol/0.0352\ mol×100\%=7.72\%$
* Partial pressure of oxygen:
$7.72/100×1.56\ atm=0.12\ atm$
Mol fraction of CO:
$100-14.10-7.72=78.18\%$
* Partial pressure of CO:
$78.18/100×1.56\ atm=1.22\ atm$
* Mass of CO:
$78.18/100×0.0352\ mol×28.01\ g/mol=0.771\ g$
* Mass of $CO_2$:
$14.10/100×0.0352\ mol×44.01\ g/mol=0.218\ g$
